Will Astilbe grow ok in slightly acid soil
Hostas and Hydrangeas are in the same bed. Soil under the added humus is clay.
Certified GKH Gardening Expert
Yes, Ph of 5.8 to 6.8 on the neutral side is desirable.
Here are in growing and care requirements to refresh you.
I also have this combination in my MN garden! It's a pretty combination.